Patent attributes
A portable electrical drilling assembly includes an electric motor rotating a gear contained within a gear box housing, a connector reversibly coupling the gear to a splined shaft with the splined shaft extending within and engaging an internal surface of a cutter or reamer with the shaft and cutter/reamer defining a cutter-spline drive, a pivoting power feed mechanism coupled to the gear box housing, and a spindle coupled to the feed mechanism for receiving the cutter or reamer. The gear rotation rotates the splined shaft and reamer/cutter to drill/ream a hole, with the pivoting of the power feed mechanism controlling the depth of the drilled or reamed hole. The separate coupling of the splined shaft and cutter/reamer and interchangeability of cutters/reamers allows the assembly to be used in a confined space while still achieving deep drilling of holes in workpieces. The cutter-spline drive can be used in other drilling assemblies.
